Definition of 'Reinvestment Rate'
The amount of interest that can be earned when money is taken out of one fixed-income investment and put into another. The reinvestment rate is the amount of interest the investor could earn if s/he purchased a new bond, if the same investor is holding a callable bond that is called due because interest rates have declined. If the original bond paid 5% and the new bond pays 3%, the reinvestment rate is 3%.
The possibility of such an interest-rate drop is called "reinvestment rate risk".
Investopedia explains 'Reinvestment Rate'
Anticipated reinvestment rates play a role in investors' decisions about what term to select when purchasing a bond or CD. An investor who expects interest rates to rise might select a shorter-term investment, under the assumption that the reinvestment rate when the bond or CD matures will be higher than the interest rates that can be locked into on longer-maturity investments today.